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cc2538: uart: Make it possible to use several UARTs simultaneously

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This avoids the limitation of having a single UART available at runtime, without
duplicating code.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
This commit is contained in:
Benoît Thébaudeau 2014-04-04 19:33:11 +02:00
parent db754a57d7
commit d93d129da6
12 changed files with 353 additions and 146 deletions
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49
cpu/cc2538/dev/uart.h
View file

@ -47,42 +47,17 @@
#include <stdint.h>
/*---------------------------------------------------------------------------*/
/** \name UART instance count
* @{
*/
#define UART_INSTANCE_COUNT 2
/** @} */
/*---------------------------------------------------------------------------*/
/** \name UART base addresses
* @{
*/
#define UART_0_BASE 0x4000C000
#define UART_1_BASE 0x4000D000
/* Default to UART 0 unless the configuration tells us otherwise */
#ifdef UART_CONF_BASE
#define UART_BASE UART_CONF_BASE
#else
#define UART_BASE UART_0_BASE
#endif
/** @} */
/*---------------------------------------------------------------------------*/
/**
* \name Baud rate defines
*
* Used in uart_init() to set the values of UART_IBRD and UART_FBRD in order to
* achieve some standard baud rates.
* @{
*/
#define UART_CLOCK_RATE 16000000 /* 16 MHz */
#define UART_CTL_HSE_VALUE 0
#define UART_CTL_VALUE ( UART_CTL_RXE | UART_CTL_TXE | (UART_CTL_HSE_VALUE << 5) )
/* DIV_ROUND() divides integers while avoiding a rounding error: */
#define DIV_ROUND(num, denom) ( ((num) + (denom) / 2) / (denom) )
#define BAUD2BRD(baud) DIV_ROUND(UART_CLOCK_RATE << (UART_CTL_HSE_VALUE + 2), (baud))
#define uart_set_baudrate(baud) do { \
REG(UART_BASE | UART_IBRD) = BAUD2BRD(baud) >> 6; \
REG(UART_BASE | UART_FBRD) = BAUD2BRD(baud) & 0x3f; \
REG(UART_BASE | UART_LCRH) = REG(UART_BASE | UART_LCRH); \
} while(0)
/** @} */
/*---------------------------------------------------------------------------*/
/** \name UART Register Offsets
@ -356,18 +331,22 @@
*/
/** \brief Initialises the UART controller, configures I/O control
* and interrupts */
void uart_init(void);
* and interrupts
* \param uart The UART instance to use (0 to \c UART_INSTANCE_COUNT - 1)
*/
void uart_init(uint8_t uart);
/** \brief Sends a single character down the UART
* \param uart The UART instance to use (0 to \c UART_INSTANCE_COUNT - 1)
* \param b The character to transmit
*/
void uart_write_byte(uint8_t b);
void uart_write_byte(uint8_t uart, uint8_t b);
/** \brief Assigns a callback to be called when the UART receives a byte
* \param uart The UART instance to use (0 to \c UART_INSTANCE_COUNT - 1)
* \param input A pointer to the function
*/
void uart_set_input(int (* input)(unsigned char c));
void uart_set_input(uint8_t uart, int (* input)(unsigned char c));
/** @} */